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Jellyfish stings

Key points about jellyfish stings

There are several kinds of jellyfish found in Aotearoa New Zealand and some can deliver a painful sting.
Most jellyfish stings are not serious and, if given quick first aid, people are not likely to develop major symptoms.
This page provides information about jellyfish stings, including the symptoms and how to treat them.

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Jellyfish stings can cause immediate intense pain, with burning and itching at the site of the sting. The sting often appears as a weal with surrounding redness.

In rare cases, jellyfish stings can cause a serious allergic reaction called anaphylaxis. This is potentially life-threatening and must be treated as a medical emergency. It requires immediate treatment and urgent medical attention – call 111.

Symptoms of anaphylaxis include:

swelling around the lips and eyes
rapid development of a rash
shortness of breath or wheezing
chest tightness
severe dizziness or faints
persistent sneezing or coughing
hoarse voice
difficulty swallowing or throat tightness
signs of shock such as pale skin, rapid heartbeat and fainting.

Video: How to Treat a Jellyfish Sting

This video shows what you can do to soothe the redness and swelling after a jellyfish sting. This video may take a few moments to load.

(WebMD, US, 2016)

The Portuguese man-of-war (also called blue bottle) has a burning sting. It’s not a true jellyfish, which means there are some things you should do differently to treat the sting.

Thoroughly wash the affected area with seawater (not fresh water). Do not apply fresh water as this will activate the stingers.
Wait five minutes and then wipe the tentacles off with a dry towel. Be careful not to get stingers on your hands – wear gloves if you have some.
Place the stung area in warm water (45°C) for 20 minutes.
Do not apply vinegar, methylated spirits or alcohol, as these will make the sting more painful.
If you have pain, try taking a painkiller such as paracetamol.
Blue bottle stings usually last about 15 to 20 minutes. Seek immediate medical assistance if you experience severe, lasting pain, or if the affected area becomes infected.